#!/usr/bin/env python
# encoding: utf-8
'''
@author: ZhouXin
@time: 2018/5/31 13:01
'''
import builtins
from functools import reduce


def fn(x, y):
    return x * 10 + y


def char2num(s):
    digits = {'0': 0, '1': 1, '2': 2, '3': 3, '4': 4, '5': 5, '6': 6, '7': 7, '8': 8, '9': 9}
    return digits[s]


print(reduce(fn, map(char2num, '123456')))
